Re: [RFC][PATCH 1/10] PM: Add flag for devices capable of generating run-time wake-up events

Matthew Garrett
2009-11-16T21:05:45Z

On Mon, Nov 16, 2009 at 04:00:49PM -0500, Alan Stern wrote:
> On Mon, 16 Nov 2009, Rafael J. Wysocki wrote:
> > Yes, in general. The platform.
>
> And for non-platform devices (hot-pluggable, for example)? Presumably
> you would want the driver that detects and registers the device to set
> this flag.

Are there any cases where the bus code won't know this?

> > > What if the kernel can't tell whether or not the device can generate
> > > runtime wake-up events?
> >
> > Do you have any specific examples in mind?
>
> What about Matthew's example of an ACPI GPE which might or might not
> cause a runtime wake-up event, depending on the AML code in the BIOS?

The platform knows whether or not that's the case.

--
Matthew Garrett | mjg59@srcf.ucam.org